The topic of bitcoin units seems to come up often around here - and particularly the perceived psychological impediment to dealing with fractions of a coin.
It occurs to me that in user interfaces, it might be handy to have some visual cues (eg in the form of coloured coin images) as to the sum involved in any particular transaction.
For example - any amount above 1BTC would be Gold (as per the common bitcoin coin logos)
An amount from 1 bitcent to less than 1BTC - Silver
From 1 milli-bitcoin to less than 1 bitcent - Blue
from 1 micro-bitcoin to less than 1 milli-bitcoin Green
0 to less than 1 micro-bitcoin (ie satoshis) Red
The pink and brown ones were just thrown in to make it clear how nano/pico fit in - perhaps for future use.
I liked the idea of 'pinkies' being a sub-satoshi unit (like the pinky finger) and well.. brown for pico because it reminds me of those muddy coloured 1 and 2c pieces we used to have here in australia.
The colour scheme is primarily based on SI units milli,micro,nano.. except that bitcents and satoshis are interesting enough to warrant extra colour divides.
As a slight hint that silver(bitcents) and red(satoshis) are a little different - I've put the c & s on the right side of the corresponding coin image too.
Below is an outline of the scheme I had in mind.
I'm hoping something like this might be picked up as a standard across shopping carts, wallet software etc..
My apologies if something like this is already out there - I couldn't find it.
Feedback on whether my choice of colours is good/awful welcome.
Any GUI builders interested in incorporating this and helping evangelize it as a standard?
EDIT: to make this clearer, I'm not suggesting that a particular displayed amount would be shown multicoloured as it is in the image below.
That's just to show where the divisions lie and help people understand the units.
EDIT: changed satoshis from red to black - because satoshi is surely some sort of ninja.
oh.. and because it might help red-green colourblind people, and because some people are averse to rainbows.
As far as the psychological impediment to dealing in fractions of a bitcoin - I'm hoping that if there was a widely understood naming and colour scheme - that things such as the blue millicoin or green uBTC would feel like tradable units in their own right more than just some number with a bunch of leading zeroes.
It should theoretically help reduce errors, especially for newcomers to bitcoin.
Feel free to throw me a few greenies if you like the idea
svg version avail here: http://precisium.com.au/images/bitcoin/units/chart.svg
Thanks to bitboy for the svg version of the gold bitcoin. ( from http://forum.bitcoin.org/?topic=1756.0